JP2009132717A - Thiazole organic semiconductor compound and organic thin film transistor using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an organic semiconductor compound using thiazole, and an organic thin film transistor using the thiazole-containing organic semiconductor compound as an organic semiconductor layer. <P>SOLUTION: The novel organic semiconductor compound using thiazole has liquid crystallinity, is excellent in thermal stability and is thus can be used as the organic semiconductor layer in the organic thin film transistor. In order to achieve this, a silicon oxide film is formed on a silicon substrate, and the organic semiconductor layer containing thiazole is formed on the silicon oxide. A source electrode and a drain electrode are formed on both edges on top of the organic semiconductor layer. The organic thin film transistor using the organic semiconductor layer has advantages including improved on/off ratio, excellent thermal stability and can be manufactured using a solution process. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an organic semiconductor compound and an organic thin film transistor using the same, and more particularly, to an organic semiconductor compound containing thiazole and an organic thin film transistor that can be used in a solution process and improved in a blinking ratio.

  Organic thin-film transistors are electronic devices that have been actively researched and developed recently with many advantages. In particular, the organic thin film transistor can be easily applied to a flexible electronic circuit board that is simple and inexpensive to manufacture, can be bent or folded without being broken by an impact.

  Compared to existing thin film transistors using amorphous silicon and polysilicon, organic thin film transistors are simple in manufacturing process, can be produced at low cost, and are excellent in compatibility with substrates on which other electronic components are mounted. Recently, research has been actively conducted.

However, the organic thin film transistor also has a problem that the on / off ratio and the charge mobility should be large in order to become a transistor element with excellent performance.
Moreover, the organic semiconductor which comprises the said organic thin-film transistor is divided into a low molecule and a polymer according to molecular weight.

  In general, small molecules are easy to purify and have excellent electrical properties because they can remove impurities almost completely. However, solution processes such as spin coating and printing are not possible, and vacuum is required through expensive vacuum equipment. Since the thin film must be manufactured by a vapor deposition method, it has a disadvantage of being expensive.

  On the other hand, in the case of polymers, it is difficult to remove impurities because it is difficult to purify with high purity, but it has excellent heat resistance, solution processes such as spin coating and printing are possible, and manufacturing process costs Is advantageous in that it is inexpensive and mass production is advantageous.

  Accordingly, development of an organic semiconductor compound having such advantages of a low molecule and a polymer is required.

  The first object of the present invention to solve the above problems is an organic semiconductor that can be used in an organic thin film transistor with improved blinking ratio, excellent thermal stability, and capable of a solution process. It is to provide a compound.

  The second object of the present invention is to provide a method for producing an organic thin film transistor using an organic semiconductor compound provided by the achievement of the first object.

  The third object of the present invention is to provide an organic thin film transistor using an organic semiconductor compound provided by the achievement of the first object.

  In order to achieve the above first object, the present invention provides a thiazole organic semiconductor compound represented by the following chemical formula 1.

  In Formula 1, R1, R2, R3, and R4 are substituted with hydrogen, an alkyl group having 1 to 25 carbon atoms, an alkoxy group having 1 to 25 carbon atoms, an alkyl group having 1 to 25 carbon atoms, and an alkoxy group. Selected from the group consisting of allyl groups having 6 to 30 carbon atoms.

  In the above chemical formula 1, X and Y are

のうちからお互いに同一であったり独立的に選択された置換体または置換体グループであり、上記式で、Ｚ１は、お互いに独立的に一置換または多置換された置換基であって、水素、ヒドロキシ基、置換または非置換されたメチル基、カルボニル基、アミノ基、置換または非置換された炭素数１〜３０のアルキルアミノ基、置換または非置換された炭素数１〜３０のアリルアミノ基、置換または非置換されたヘテロアリルアミノ基、シアノ基、ハロゲン原子、置換または非置換された炭素数１〜３０のアルキル基、置換または非置換された炭素数３〜３０のシクロアルキル基、置換または非置換された炭素数１〜３０のアルコキシ基、置換または非置換された炭素数６〜３０のアリル基、置換または非置換された炭素数６〜３０のアリルアルキル基、置換または非置換された炭素数２〜３０のヘテロアリル基、及び置換または非置換された炭素数２〜３０のヘテロ環基からなる群より選択される。

A substituent or a group of substituents that are the same or independently selected from each other, wherein Z1 is a mono- or poly-substituted substituent independently of each other, Hydroxy group, substituted or unsubstituted methyl group, carbonyl group, amino group, substituted or unsubstituted alkylamino group having 1 to 30 carbon atoms, substituted or unsubstituted allylamino group having 1 to 30 carbon atoms, Substituted or unsubstituted heteroallylamino group, cyano group, halogen atom, substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, substituted or unsubstituted cycloalkyl group having 3 to 30 carbon atoms, substituted or substituted An unsubstituted alkoxy group having 1 to 30 carbon atoms, a substituted or unsubstituted allyl group having 6 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms Group, selected from the group consisting of substituted or unsubstituted heteroaryl group having 2 to 30 carbon atoms, and substituted or unsubstituted heterocyclic group having 2 to 30 carbon atoms.

  R5, R6, R7, and R8 are hydrogen, an ethylene oxide group having 1 to 25 carbon atoms, an alkyl group having 1 to 25 carbon atoms, a fluorinated alkyl group having 1 to 25 carbon atoms, or an alkoxy group having 1 to 25 carbon atoms. Selected from the group consisting of a group, an alkylene oxide group having 1 to 25 carbon atoms, a polydimethylsiloxane group having 1 to 25 carbon atoms, an alkylene sulfide group having 1 to 25 carbon atoms, and an ethylene sulfide group having 1 to 25 carbon atoms. .

  In order to achieve the second object described above, the present invention includes the steps of i) preparing a silicon substrate, ii) forming an insulating layer using silicon oxide on the silicon substrate, and iii) the insulating layer. There is provided a method of manufacturing an organic thin film transistor, comprising: forming an organic semiconductor layer using Formula 1; and iv) forming a source electrode and a drain electrode on the organic semiconductor layer.

  Here, the step of forming the organic semiconductor layer is characterized in that the organic semiconductor layer is formed by vapor-depositing the material represented by the above Chemical Formula 1 under a high vacuum.

  Here, the step of forming the organic semiconductor layer is characterized in that the substance represented by the above Chemical Formula 1 is dissolved in a solution and then coated to form the organic semiconductor layer.

  In order to achieve the third object described above, the present invention includes a silicon substrate layer, an insulating layer using silicon oxide above the silicon substrate layer, an organic semiconductor layer using Formula 1 above the insulating layer, And an organic thin film transistor device including an electrode layer on the organic semiconductor layer.

  Here, the organic semiconductor layer is formed by vapor-depositing the material represented by the chemical formula 1 in a high vacuum state.

  Here, the organic semiconductor layer is formed by dissolving the substance represented by Chemical Formula 1 in a solution and then coating it.

  When the novel thiazole organic semiconductor compound of the present invention is used in an organic thin film transistor, an organic thin film transistor having an improved blinking ratio, excellent thermal stability and capable of a solution process can be obtained.

  While the invention is susceptible to various modifications, it may have various embodiments, specific embodiments are illustrated in the drawings and will be described in detail in the detailed description.

  However, this should not be construed as limiting the present invention to the specific embodiments, but should be understood to include all modifications, equivalents or alternatives that fall within the spirit and scope of the present invention.

  In addition, terms such as “first” and “second” can be used when describing various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

  Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Hereinafter, the same reference numerals are used for the same components in the drawings, and a duplicate description of the same components is omitted. It should be noted that the following examples are for illustrative purposes only and do not limit the scope of the invention.

  The thiazole organic semiconductor compound according to the present invention has a feature represented by Chemical Formula 1.

  In the chemical formula 1, R1, R2, R3, and R4 may be the same or different from each other, and may be hydrogen, an alkyl group having 1 to 25 carbon atoms, an alkoxy group having 1 to 25 carbon atoms, Alternatively, it can be selected from the group consisting of an alkyl group having 1 to 25 carbon atoms and an allyl group having 6 to 30 carbon atoms substituted with an alkoxy group.

  In the above chemical formula 1, X and Y are

のうちからお互いに同一であったり独立的に選択された置換体または置換体グループであり、上記式で、Ｚ１は、お互いに独立的に一置換または多置換された置換基であって、水素、ヒドロキシ基、置換または非置換されたメチル基、カルボニル基、アミノ基、置換または非置換された炭素数１〜３０のアルキルアミノ基、置換または非置換された炭素数１〜３０のアリルアミノ基、置換または非置換されたヘテロアリルアミノ基、シアノ基、ハロゲン原子、置換または非置換された炭素数１〜３０のアルキル基、置換または非置換された炭素数３〜３０のシクロアルキル基、置換または非置換された炭素数１〜３０のアルコキシ基、置換または非置換された炭素数６〜３０のアリル基、置換または非置換された炭素数６〜３０のアリルアルキル基、置換または非置換された炭素数２〜３０のヘテロアリル基、及び置換または非置換された炭素数２〜３０のヘテロ環基からなる群より選択される。

A substituent or a group of substituents that are the same or independently selected from each other, wherein Z1 is a mono- or poly-substituted substituent independently of each other, Hydroxy group, substituted or unsubstituted methyl group, carbonyl group, amino group, substituted or unsubstituted alkylamino group having 1 to 30 carbon atoms, substituted or unsubstituted allylamino group having 1 to 30 carbon atoms, Substituted or unsubstituted heteroallylamino group, cyano group, halogen atom, substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, substituted or unsubstituted cycloalkyl group having 3 to 30 carbon atoms, substituted or substituted An unsubstituted alkoxy group having 1 to 30 carbon atoms, a substituted or unsubstituted allyl group having 6 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms Group, selected from the group consisting of substituted or unsubstituted heteroaryl group having 2 to 30 carbon atoms, and substituted or unsubstituted heterocyclic group having 2 to 30 carbon atoms.

  R5, R6, R7 and R8 are independently of each other hydrogen, ethylene oxide group having 1 to 25 carbon atoms, alkyl group having 1 to 25 carbon atoms, fluorinated alkyl group having 1 to 25 carbon atoms, carbon number It consists of 1 to 25 alkoxy groups, 1 to 25 alkylene oxide groups, 1 to 25 carbon polydimethylsiloxane groups, 1 to 25 alkylene sulfide groups, and 1 to 25 ethylene sulfide groups. Selected from the group.

   [Production Example 1] Synthesis of Chemical Formula 2

  Chemical formula 2 was synthesized using the above reaction scheme 1. Formula 2 is an example of Formula 1. Substance (1) is a substance sold by Aldrich company.

  200 ml of THF dried with sodium was lowered to 0 ° C., and 15.18 ml (138 mmol) TiCl 4 was gradually added while stirring well. After 15 minutes, 18 g (276 mmol) Zinc was added and stirred for 1 hour. Thereafter, the temperature was lowered again to 0 ° C., 13 g (115.92 mmol) of the compound (1) was dissolved in 50 ml of dried THF, and the mixture was stirred with heating for 3 hours. After stirring, the temperature was gradually lowered to room temperature, and the reaction was terminated by adding 50 ml of ice water, and then the precipitated material was filtered and recrystallized again using cyclohexane to obtain compound (2). . (Yield: 65%)

  DMF 14 ml and POCl3 1.5 ml (16.5 mmol) were mixed well at 0 ° C. and stirred well, and this was slowly stirred into 2.74 g (14.25 mmol) compound (2) dissolved in DMF 40 ml at 0 ° C. I did. After the addition, the mixture was gradually raised to room temperature, stirred again at 50 ° C. for 3 hours, poured into 100 ml of 1M NaOH aqueous solution for neutralization, extracted with benzine, and purified using a silica column apparatus (3 ) (Yield: 70.08%)

  Dissolve 2.20 g (10 mmol) of compound (3) and 0.541 g (4.5 mmol) of dithioxamide in 20 ml of 1,2-dichlorobezene, stir and heat for 24 hours or more, then lower the temperature to room temperature and put into 100 ml of ethanol This was precipitated and filtered. The filtered material was washed many times with ethanol to obtain a compound of Formula 2 through a silica column apparatus. (Yield: 22%)

  The structure of the compound of Chemical Formula 2 was confirmed through 1H-NMR and mass spectrometry in FIG. Considering the results of thermogravimetric analysis of the compound of Formula 2 synthesized in FIG. 2, the 5% weight loss of the compound of Formula 2 synthesized was measured at 302 ° C. This shows that the synthesized Chemical Formula 2 is excellent in thermal stability. Considering the results of time-difference calorimetry in FIG. 3, the synthesized compound of Formula 2 was measured to have phase transition points at 155 ° C. and 240 ° C., respectively. In FIG. 3 which is this time-difference calorimetry, it can be indirectly understood that the compound 2 has liquid crystallinity by observing two phase transition temperatures. Considering the x-ray crystallographic analysis graph of the organic semiconductor represented by the chemical formula 2 in FIG. 4, it can be seen that the organic semiconductor represented by the chemical formula 2 has five peaks and has crystallinity.

  A method of manufacturing an organic thin film transistor device using Chemical Formula 1 as an organic semiconductor layer according to the present invention includes the steps of forming a silicon substrate, forming an insulating layer using silicon dioxide, and using Chemical Formula 1. Forming an organic semiconductor layer and forming a source electrode and a drain electrode.

[Production Example 2] Production of Organic Thin Film Transistor Specifically, the production example relates to a method of producing an organic thin film transistor element using Chemical Formula 2 as an example of Chemical Formula 1 for an organic semiconductor layer.

  First, a silicon substrate (110) is prepared. The silicon substrate 110 is preferably n-type. The provided n-type silicon substrate functions as a gate electrode of an organic thin film transistor to be formed later.

  Next, an insulating layer 120 is formed on the substrate using silicon oxide thermally grown to a thickness of 300 nm. In addition, the insulating layer 120 can be formed using various methods other than thermal growth. That is, it can also be formed using chemical vapor deposition, physical vapor deposition or atomic layer deposition.

  Subsequently, the compound of Formula 2 is vacuum deposited or dissolved in a solution such as chlorobenzene, and then spin-coated to form an organic semiconductor (130) layer having a thickness of 50 nm.

  Finally, the source and drain electrodes (140) are formed by vacuum-depositing 30 nm of gold on the already formed organic semiconductor layer (130).

The organic thin film transistor manufactured through the above-described process was measured for electrical characteristics shown in FIG. 5 through a semiconductor characteristic analysis equipment. Referring to FIG. 5, it can be seen that the organic thin film transistor of this production example exhibits excellent characteristics with a flashing ratio (on / off ratio) of 10 ⁶ or more.

  FIG. 6 is a cross-sectional view of an element of an organic thin film transistor that uses a compound represented by Chemical Formula 1 in an organic semiconductor layer.

  Referring to FIG. 6, the organic thin film transistor of this example includes a silicon substrate (110), an insulating layer (120), an organic semiconductor layer (130), and an electrode layer (140).

  An insulating layer 120 is formed on the silicon substrate 110 that serves as a gate electrode. The insulating layer 120 is made of silicon oxide, and an organic semiconductor layer 130 is provided on the insulating layer 120. The organic semiconductor layer 130 is formed using an organic compound represented by Formula 2. In addition, an electrode layer (140) made of a metal is formed on the upper side surface of the organic semiconductor layer (130). The formed electrode layer functions as a source electrode and a drain electrode. Preferably, the electrode layer includes gold. However, it is obvious to those skilled in the art that various materials can be used as the electrode layer as long as the conductor can be formed on the organic semiconductor layer using an appropriate method.

  The substrate layer (110) uses n-type silicon, and the substrate layer (110) includes a gate electrode function. The insulating layer (120) is made of silicon oxide thermally grown to a thickness of 300 nm on the substrate layer (110). The organic semiconductor layer (130) uses the chemical formula 1, and as an example, the compound of the chemical formula 2 is vacuum-deposited or dissolved in a solution such as chlorobenzene, and then spin coated to form a 50 nm thick organic semiconductor. Form a layer. The electrode forming layer 140 is formed by vacuum depositing 30 nm of gold on the organic semiconductor layer to form source and drain electrodes.

2 is a 1H-NMR glyph of an organic semiconductor compound represented by Chemical Formula 2. 4 is a graph showing a thermogravimetric analysis curve of an organic semiconductor compound represented by Chemical Formula 2. 2 is a graph showing a time difference calorimetric analysis curve of an organic semiconductor compound represented by Chemical Formula 2. It is an x-ray crystal analysis grep of an organic semiconductor represented by Chemical Formula 2. This is a graph showing the electrical characteristics of an organic thin film transistor element using Chemical Formula 2 as an organic semiconductor layer. 1 is a diagram of an organic thin film transistor device using Chemical Formula 1 for an organic semiconductor layer.

Explanation of symbols

110 substrate layer 120 insulating layer 130 organic semiconductor layer 140 electrode layer

Claims (7)

A thiazole organic semiconductor compound represented by Formula 1.

(In Formula 1, R1, R2, R3, and R4 are substituted with hydrogen, an alkyl group having 1 to 25 carbon atoms, an alkoxy group having 1 to 25 carbon atoms, an alkyl group having 1 to 25 carbon atoms, and an alkoxy group. Or an allyl group having 6 to 30 carbon atoms.
In the above chemical formula 1, X and Y are

A substituent or a group of substituents that are the same or independently selected from each other, wherein Z1 is a mono- or poly-substituted substituent independently of each other, Hydroxy group, substituted or unsubstituted methyl group, carbonyl group, amino group, substituted or unsubstituted alkylamino group having 1 to 30 carbon atoms, substituted or unsubstituted allylamino group having 1 to 30 carbon atoms, Substituted or unsubstituted heteroallylamino group, cyano group, halogen atom, substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, substituted or unsubstituted cycloalkyl group having 3 to 30 carbon atoms, substituted or substituted An unsubstituted alkoxy group having 1 to 30 carbon atoms, a substituted or unsubstituted allyl group having 6 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms Group, selected from the group consisting of substituted or unsubstituted heteroaryl group having 2 to 30 carbon atoms, and substituted or unsubstituted heterocyclic group having 2 to 30 carbon atoms.
R5, R6, R7, and R8 are hydrogen, an ethylene oxide group having 1 to 25 carbon atoms, an alkyl group having 1 to 25 carbon atoms, a fluorinated alkyl group having 1 to 25 carbon atoms, or an alkoxy group having 1 to 25 carbon atoms. Selected from the group consisting of a group, an alkylene oxide group having 1 to 25 carbon atoms, a polydimethylsiloxane group having 1 to 25 carbon atoms, an alkylene sulfide group having 1 to 25 carbon atoms, and an ethylene sulfide group having 1 to 25 carbon atoms. . ) i) preparing a silicon substrate;
ii) forming an insulating layer on the silicon substrate using silicon oxide;
iii) forming an organic semiconductor layer on the insulating layer using Formula 1; and
iv) A method for producing an organic thin film transistor, comprising forming a source electrode and a drain electrode on the organic semiconductor layer.

(In Formula 1, R1, R2, R3, and R4 are substituted with hydrogen, an alkyl group having 1 to 25 carbon atoms, an alkoxy group having 1 to 25 carbon atoms, an alkyl group having 1 to 25 carbon atoms, and an alkoxy group. Or an allyl group having 6 to 30 carbon atoms.
In the above chemical formula 1, X and Y are

A substituent or a group of substituents that are the same or independently selected from each other, wherein Z1 is a mono- or poly-substituted substituent independently of each other, Hydroxy group, substituted or unsubstituted methyl group, carbonyl group, amino group, substituted or unsubstituted alkylamino group having 1 to 30 carbon atoms, substituted or unsubstituted allylamino group having 1 to 30 carbon atoms, Substituted or unsubstituted heteroallylamino group, cyano group, halogen atom, substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, substituted or unsubstituted cycloalkyl group having 3 to 30 carbon atoms, substituted or substituted An unsubstituted alkoxy group having 1 to 30 carbon atoms, a substituted or unsubstituted allyl group having 6 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms Group, selected from the group consisting of substituted or unsubstituted heteroaryl group having 2 to 30 carbon atoms, and substituted or unsubstituted heterocyclic group having 2 to 30 carbon atoms.
R5, R6, R7, and R8 are hydrogen, an ethylene oxide group having 1 to 25 carbon atoms, an alkyl group having 1 to 25 carbon atoms, a fluorinated alkyl group having 1 to 25 carbon atoms, or an alkoxy group having 1 to 25 carbon atoms. Selected from the group consisting of a group, an alkylene oxide group having 1 to 25 carbon atoms, a polydimethylsiloxane group having 1 to 25 carbon atoms, an alkylene sulfide group having 1 to 25 carbon atoms, and an ethylene sulfide group having 1 to 25 carbon atoms. . ) In claim 2,
The method of manufacturing an organic thin film transistor, wherein the step of forming the organic semiconductor layer comprises depositing the material represented by Chemical Formula 1 under high vacuum to form the organic semiconductor layer. In claim 2,
The organic semiconductor layer is formed by dissolving the substance represented by Chemical Formula 1 in a solution and then coating the organic semiconductor layer to form the organic semiconductor layer. Silicon substrate layer;
An insulating layer using silicon oxide above the silicon substrate layer;
An organic semiconductor layer using Formula 1 above the insulating layer; and
An organic thin film transistor comprising an electrode layer above the organic semiconductor layer.

(In Formula 1, R1, R2, R3, and R4 are substituted with hydrogen, an alkyl group having 1 to 25 carbon atoms, an alkoxy group having 1 to 25 carbon atoms, an alkyl group having 1 to 25 carbon atoms, and an alkoxy group. Or an allyl group having 6 to 30 carbon atoms.
In the above chemical formula 1, X and Y are

A substituent or a group of substituents that are the same or independently selected from each other, wherein Z1 is a mono- or poly-substituted substituent independently of each other, Hydroxy group, substituted or unsubstituted methyl group, carbonyl group, amino group, substituted or unsubstituted alkylamino group having 1 to 30 carbon atoms, substituted or unsubstituted allylamino group having 1 to 30 carbon atoms, Substituted or unsubstituted heteroallylamino group, cyano group, halogen atom, substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, substituted or unsubstituted cycloalkyl group having 3 to 30 carbon atoms, substituted or substituted An unsubstituted alkoxy group having 1 to 30 carbon atoms, a substituted or unsubstituted allyl group having 6 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms Group, selected from the group consisting of substituted or unsubstituted heteroaryl group having 2 to 30 carbon atoms, and substituted or unsubstituted heterocyclic group having 2 to 30 carbon atoms.
R5, R6, R7, and R8 are hydrogen, an ethylene oxide group having 1 to 25 carbon atoms, an alkyl group having 1 to 25 carbon atoms, a fluorinated alkyl group having 1 to 25 carbon atoms, or an alkoxy group having 1 to 25 carbon atoms. Selected from the group consisting of a group, an alkylene oxide group having 1 to 25 carbon atoms, a polydimethylsiloxane group having 1 to 25 carbon atoms, an alkylene sulfide group having 1 to 25 carbon atoms, and an ethylene sulfide group having 1 to 25 carbon atoms. . ) In claim 5,
An organic thin film transistor, wherein the organic semiconductor layer is formed by vapor-depositing a material represented by the above Chemical Formula 1 in a high vacuum state. In claim 5,
An organic thin film transistor, wherein the organic semiconductor layer is formed by dissolving the substance represented by Chemical Formula 1 in a solution and then coating the material.

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